US7856828B2 - Flameholder arm for an afterburner - Google Patents
Flameholder arm for an afterburner Download PDFInfo
- Publication number
- US7856828B2 US7856828B2 US11/693,177 US69317707A US7856828B2 US 7856828 B2 US7856828 B2 US 7856828B2 US 69317707 A US69317707 A US 69317707A US 7856828 B2 US7856828 B2 US 7856828B2
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- US
- United States
- Prior art keywords
- arm
- orifice
- finger
- ventilation duct
- duct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
- F23R3/16—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration with devices inside the flame tube or the combustion chamber to influence the air or gas flow
- F23R3/18—Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants
- F23R3/20—Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants incorporating fuel injection means
Definitions
- the present invention relates to a flameholder arm of an afterburner in a turbomachine such as a jet engine.
- an afterburner comprises a series of flameholder arms each of which is formed of a hollow dihedron the tip of the vertex of which is directed toward the upstream end of the afterburner and which is closed at the downstream end by a heatshield.
- a fuel injection harness extends radially inside the arm from an outer casing of the afterburner. This injection harness is connected to fuel supply means and comprises holes for spraying fuel.
- a ventilation duct extends in the arm substantially parallel to the fuel injection harness, between the latter and the tip of the dihedron of the arm and comprises at its radially outermost end an opening for picking up cooling air intended to be diffused into the arm through holes in the duct.
- the radially innermost end of the ventilation duct is closed and comprises a centering finger engaged in an orifice in the arm.
- the ventilation duct also comprises, near its radially innermost end, a stud projecting downstream and the free end of which is engaged in a corresponding orifice in the heatshield in order to hold the ventilation duct in place.
- An orifice formed in the stud accommodates the lower end of the fuel injection harness in order to center it in the arm.
- the arm is assembled with the ventilation duct and the heatshield which is fixed to the arm by means of stepped welded pins and which immobilizes the ventilation duct.
- the fuel injection harness is mounted in the arm from the outer casing of the afterburner, by engaging its radially innermost end between the heatshield and the ventilation duct to the point where this end becomes housed in the centering orifice formed in the stud of the duct.
- the ventilation duct In operation, the ventilation duct is subjected to significant vibrations which cause frictional wear of its stud and of the corresponding orifice in the heatshield, something which results in the duct shifting inward and in the finger of the duct protruding into the main air stream, and results in wear and enlargement of the orifice in the arm which accepts the duct centering finger.
- the inward shift of the ventilation duct may cause the fuel injection harness to disengage from the orifice in the stud and may cause the harness to break.
- the invention proposes a flameholder arm for an afterburner comprising a body in the form of an open dihedron, a ventilation duct extending inside the body and comprising, at one end, a centering finger engaged in an orifice in the body, a fuel injection harness extending inside the body along the ventilation duct, means for guiding and centering the harness with respect to the duct and a heatshield fixed to the body and closing the open face of the dihedron, wherein the ventilation duct comprises means of immobilization in the body of the arm which are independent of the heatshield.
- the ventilation duct is centered and immobilized in the flameholder arm independently of the heatshield which means that the centering and attachment stud provided on the duct in the prior art can be dispensed with.
- the duct centering finger passes through the orifice formed in the body of the arm and comprises the means for immobilizing the duct on the body of the arm.
- these immobilizing means comprise an annular shoulder formed on the centering finger and intended to come to bear against the edge of the orifice in the body of the arm, on the inside of the arm, and means of retaining the finger in this orifice, these means being formed at the end of the finger external to the arm, these retaining means comprising an annular component fixed by brazing or welding to the duct centering finger.
- the shoulder of the centering finger is pressed against the body of the arm by the annular component which is fixed to the end of this finger, on the outside of the arm.
- the duct is fixed without play onto the body of the arm and radial vibrations of the duct with respect to the body of the arm are avoided.
- this annular component may also be made for this annular component to comprise at least one flat collaborating, by butting against it, with a corresponding element of the body of the arm in order to contribute to the rotational immobilization of the duct relative to the arm.
- the ventilation duct also comprises a transverse lip which comprises an orifice for centering the fuel injection harness and which occupies almost all of the available space inside the arm, so as to prevent the fuel injection harness from being fitted incorrectly.
- the blind fitting of the fuel injection harness inside the body of the arm can no longer result in an incorrect layout of the fuel injection harness and avoids the risk of wear and damage to the harness and to the body of the arm.
- the invention also proposes a ventilation duct of a flameholder arm comprising an open end and an end formed with a substantially axial finger, wherein this finger has an annular shoulder for bearing against a support.
- This ventilation duct is also one which is formed with a transverse lip comprising a through-orifice the axis of which is substantially parallel to the longitudinal axis of the duct.
- the invention also relates to a turbomachine, such as an airplane jet engine, and which comprises at least one flameholder arm of the type described in the foregoing.
- FIG. 1 is a partial schematic view in axial section of a turbomachine afterburner
- FIG. 2 is a view on a larger scale of part of a flameholder arm of FIG. 1 and illustrates a device for fixing a ventilation duct in the flameholder arm according to the prior art;
- FIG. 3 is a view in section on III-III of FIG. 2 , on a larger scale;
- FIG. 4 is a view corresponding to FIG. 2 but illustrates a fixing device according to the invention
- FIG. 5 is a view in section on V-V of FIG. 4 , on a larger scale
- FIG. 6 is a view from beneath of the arm of FIG. 4 .
- FIGS. 1 to 3 a flameholder arm 10 of the prior art is mounted on a casing 12 of a jet engine afterburner, at its radially outermost end, this arm 10 extending substantially radially into the afterburner and passing through a confluence sheet 14 which separates the main air stream 16 of hot combustion gases from the bypass air stream 18 supplied by a fan mounted on the front end of the jet engine.
- the flameholder arm 10 comprises a body 20 in the form of an open dihedron, the tip of the vertex 22 of which is directed upstream and the opening of which is directed downstream and in which a ventilation duct 24 , a fuel injection harness 26 and a heatshield 28 of C-shaped cross section and which closes the open face of the body 22 are mounted.
- the ventilation duct 24 extends inside the arm along the tip of the vertex 22 and comprises a radially outermost end which is open and supplied with air from the bypass air stream 18 via an opening in the radially outermost part of the body of the arm.
- the radially innermost part of the duct 24 comprises multiple perforations for distributing air within the arm.
- the radially innermost end of the duct forms a cylindrical finger 30 which is engaged without clearance in an orifice in the base 32 of the body of the arm, the end of the finger 30 lying flush with the exterior face of this base 32 without protruding on the outside of the arm.
- the ventilation duct 24 comprises a lug 34 which extends downstream toward the heatshield 28 in a way substantially perpendicular to the longitudinal axis of the duct 24 and the free end of which forms a stud 36 engaged in a corresponding orifice in the shield 28 .
- This lug 34 also comprises, in an intermediate part between the ventilation duct 24 and the stud 36 , a through-orifice for accommodating the lower part of the fuel injection harness 26 in order to center this harness inside the arm 10 .
- the ventilation duct 24 is first of all positioned in the body 20 of the arm 10 , then the heatshield 28 is fitted, the stud 36 of the ventilation duct being engaged in the orifice in the shield, then the shield 28 is fixed by welding at four points 34 to the side walls of the body 20 of the arm, thus fixing the ventilation duct 24 inside the arm.
- the fuel injection harness 26 is then mounted blind inside the arm from the radially outermost end thereof. This operation demands particular care because the lower end of the fuel injection harness 26 needs to be engaged in the orifice provided in the lug 34 of the ventilation duct 24 rather than between this lug 34 and a side wall of the body 20 of the arm 10 .
- the ventilation duct 24 is subjected to radial vibrations inside the arm 10 and this results in wear of its stud 36 and of the edges of the corresponding orifice in the heatshield 28 and in wear of the finger 30 of its radially innermost end and of the edges of the corresponding orifice formed in the base 32 of the arm 10 .
- This wear results in the duct 24 dropping down inside the arm 10 , the end of the finger 30 ultimately protruding under the base 32 of the arm 10 and disturbing the afterburn conditions.
- this shifting of the ventilation duct 24 in the arm 10 may allow the radially innermost end of the fuel injection harness 26 to become dislodged from its guide orifice formed in the lug 34 of the ventilation duct, thus causing the fuel injection harness 26 to break.
- the invention proposes for the ventilation duct 24 to be mounted and fixed inside the arm 10 independently of the heatshield 28 , as has been depicted in FIGS. 4 to 6 .
- the radially innermost end of the ventilation duct 24 comprises a cylindrical finger 40 which extends along the axis of the duct 24 and comprises an annular shoulder 42 forming a surface for bearing against the edge of the orifice 44 formed in the base 32 of the arm 10 , the cylindrical finger 40 extending on the outside of this orifice and bearing an annular component 46 , such as a washer for example, which is fixed, for example by welding or brazing, to the end of the finger 40 .
- the orifice 44 is formed in the end wall 48 of a small indentation 49 in the base 32 of the arm 10 , this end wall 48 being perpendicular to the axis of the duct 24 and of the finger 40 .
- the annular component 46 may be given a corresponding shape so that this annular component has a function of preventing the rotation of the finger 40 and therefore of the duct 24 about their longitudinal axis.
- the ventilation duct 24 no longer has the stud 36 engaged in an orifice in the heatshield 28 and the lug 34 depicted in FIG. 1 is replaced by a transverse lip 50 of the duct 24 , this lip 50 being in the form of an angular sector and extending inside the body 20 of the arm 10 in such a way as to occupy, in a transverse plane, most of the available space inside the arm 10 between the duct 24 and the heatshield 28 .
- the sides 52 and 54 of the lip 50 are more or less parallel to the side walls of the arm 10 and of the shield 28 , respectively, and lie a short distance from these walls, thus preventing the radially innermost end of the fuel injection harness 26 from being mounted anywhere other than in the guide orifice 56 formed in the lip 50 .
- blind fitting of the fuel injection harness 26 in the arm 10 is greatly facilitated and any incorrect placement of the fuel injection harness is avoided while at the same time guaranteeing better at cooling of the arm 10 by the fuel and extending the life of the arm.
- the ventilation duct 24 remains held in the arm 10 and continues to perform its function of cooling the various elements of the arm.
- the fuel injection harness 26 is also held in place on the ventilation duct 24 inside the arm and cannot break.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Fuel-Injection Apparatus (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Fireproofing Substances (AREA)
Abstract
Description
-
- the wear of the heatshield which resulted from vibrations of this stud in the receiving orifice formed in the shield,
- the wear of the centering finger in the orifice formed in the body of the arm and corresponding wear of the edges of this orifice,
- the risk of the fuel injection harness breaking as a result of disengagement of the centering and guide means formed on the ventilation duct.
Claims (13)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0602742 | 2006-03-30 | ||
FR0602742A FR2899316B1 (en) | 2006-03-30 | 2006-03-30 | ARM-FIRE ARM OF A POST-COMBUSTION CHAMBER |
Publications (2)
Publication Number | Publication Date |
---|---|
US20070227151A1 US20070227151A1 (en) | 2007-10-04 |
US7856828B2 true US7856828B2 (en) | 2010-12-28 |
Family
ID=37199105
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/693,177 Active 2028-11-09 US7856828B2 (en) | 2006-03-30 | 2007-03-29 | Flameholder arm for an afterburner |
Country Status (5)
Country | Link |
---|---|
US (1) | US7856828B2 (en) |
EP (1) | EP1840469B1 (en) |
CA (1) | CA2582624C (en) |
FR (1) | FR2899316B1 (en) |
RU (1) | RU2410604C2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110067407A1 (en) * | 2009-09-23 | 2011-03-24 | Snecma | Flame-holder device comprising an arm support and a heat-protection screen that are in one piece |
US20230250776A1 (en) * | 2022-02-04 | 2023-08-10 | Rolls-Royce Plc | Reheat assembly |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2873408B1 (en) * | 2004-07-23 | 2008-10-17 | Snecma Moteurs Sa | TURBOREACTOR WITH A PROTECTION SCREEN OF THE FUEL RAMP OF A BURNER RING, THE BURNER RING AND THE PROTECTION SCREEN |
FR2928202A1 (en) * | 2008-02-29 | 2009-09-04 | Snecma Sa | FLAME HOOK FOR HEATER CHANNEL OF A TURBOJET ENGINE WITH A DISCHARGE SOLE, HEATING CHANNEL AND TURBOJET COMPRISING A HEATING CHANNEL. |
CN109352287B (en) * | 2018-12-06 | 2020-10-13 | 中国航发贵州黎阳航空动力有限公司 | Method for machining precision hole of plate welding structural part |
FR3097298B1 (en) | 2019-06-12 | 2021-06-04 | Safran Aircraft Engines | CANDLE INTEGRATED INTO THE FLAME HOLDER |
CN113701191B (en) * | 2021-09-01 | 2022-06-24 | 南昌航空大学 | Staggered flow guide middle seam type V-shaped flame stabilizer |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3698186A (en) | 1970-12-24 | 1972-10-17 | United Aircraft Corp | Afterburner combustion apparatus |
US3934409A (en) * | 1973-03-13 | 1976-01-27 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation | Gas turbine combustion chambers |
FR2709342A1 (en) | 1993-08-25 | 1995-03-03 | Snecma | Turbojet post-combustion device |
US5396761A (en) * | 1994-04-25 | 1995-03-14 | General Electric Company | Gas turbine engine ignition flameholder with internal impingement cooling |
US20050252216A1 (en) * | 2004-05-05 | 2005-11-17 | Snecma Moteurs | Device for feeding air and fuel to a burner ring in an after-burner chamber |
EP1619441A1 (en) | 2004-07-21 | 2006-01-25 | Snecma | Gas turbine engine with protection means for a fuel injector, fuel injector and protection foil. |
US7370477B2 (en) * | 2004-05-05 | 2008-05-13 | Snecma | Device for fastening a fluid duct to a turbojet casing |
-
2006
- 2006-03-30 FR FR0602742A patent/FR2899316B1/en active Active
-
2007
- 2007-03-06 EP EP07290288.5A patent/EP1840469B1/en active Active
- 2007-03-28 CA CA2582624A patent/CA2582624C/en active Active
- 2007-03-29 US US11/693,177 patent/US7856828B2/en active Active
- 2007-03-29 RU RU2007111676/06A patent/RU2410604C2/en active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3698186A (en) | 1970-12-24 | 1972-10-17 | United Aircraft Corp | Afterburner combustion apparatus |
US3934409A (en) * | 1973-03-13 | 1976-01-27 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation | Gas turbine combustion chambers |
FR2709342A1 (en) | 1993-08-25 | 1995-03-03 | Snecma | Turbojet post-combustion device |
US5396761A (en) * | 1994-04-25 | 1995-03-14 | General Electric Company | Gas turbine engine ignition flameholder with internal impingement cooling |
US20050252216A1 (en) * | 2004-05-05 | 2005-11-17 | Snecma Moteurs | Device for feeding air and fuel to a burner ring in an after-burner chamber |
US7370477B2 (en) * | 2004-05-05 | 2008-05-13 | Snecma | Device for fastening a fluid duct to a turbojet casing |
EP1619441A1 (en) | 2004-07-21 | 2006-01-25 | Snecma | Gas turbine engine with protection means for a fuel injector, fuel injector and protection foil. |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110067407A1 (en) * | 2009-09-23 | 2011-03-24 | Snecma | Flame-holder device comprising an arm support and a heat-protection screen that are in one piece |
US20230250776A1 (en) * | 2022-02-04 | 2023-08-10 | Rolls-Royce Plc | Reheat assembly |
US11788492B2 (en) * | 2022-02-04 | 2023-10-17 | Rolls-Royce Plc | Reheat assembly |
Also Published As
Publication number | Publication date |
---|---|
CA2582624A1 (en) | 2007-09-30 |
RU2007111676A (en) | 2008-10-10 |
FR2899316A1 (en) | 2007-10-05 |
RU2410604C2 (en) | 2011-01-27 |
FR2899316B1 (en) | 2008-05-16 |
EP1840469A1 (en) | 2007-10-03 |
EP1840469B1 (en) | 2018-12-05 |
US20070227151A1 (en) | 2007-10-04 |
CA2582624C (en) | 2015-01-13 |
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